Glass fibers having non-circular cross sections, and fiber-reinforced resin compact using same
a technology of non-circular cross sections and resin compacts, which is applied in the direction of solid balls, transportation and packaging, sports equipment, etc., can solve the problems of small difference between the liquid phase the 1000-poise temperature of molten glass, and the tendency of glass fibers or the like to break, etc., to achieve excellent strength, improve mechanical strength, and improve the effect of dimensional accuracy
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example 1
[0062]In present Example, first a glass composition was obtained by mixing glass raw materials in such a way that the content of SiO2 was 60.2% by mass, the content of Al2O3 was 20.1% by mass, the content of MgO was 10.1% by mass, the content of CaO was 9.5% by mass and the content of Fe2O3 was 0.1% by mass, in relation to the total amount of the glass composition. In the glass composition, the sum content of SiO2, Al2O3, MgO and CaO is 99.9% by mass, and the ratio of the content of MgO to the content of CaO, MgO / CaO is 1.1. The composition of the glass composition is shown in Table 1.
[0063]Next, crushed glass having the same composition as the composition of the glass composition was placed in a platinum boat and heated in a tubular electric furnace provided with a temperature gradient, covering a range of from 1000 to 1500° C., and the temperature at which crystals started to precipitate was taken as the liquid phase temperature.
[0064]Next, the glass composition was melted in the ...
example 2
[0071]In present Example, first a glass composition was obtained by mixing glass raw materials in such a way that the content of SiO2 was 59.2% by mass, the content of Al2O3 was 20.1% by mass, the content of MgO was 12.6% by mass, the content of CaO was 8.0% by mass and the content of Fe2O3 was 0.1% by mass, in relation to the total amount of the glass composition. In the glass composition, the sum content of SiO2, Al2O3, MgO and CaO is 99.9% by mass, and the ratio of the content of MgO to the content of CaO, MgO / CaO is 1.6. The composition of the glass composition obtained in present Example is shown in Table 1.
[0072]Next, the liquid phase temperature and the liquid phase viscosity were determined, the devitrification resistance was evaluated and the identification of the crystal species of the initial phase of devitrification was performed in exactly the same manner as in Example 1 except that the glass composition obtained in present Example was used. The results thus obtained ar...
example 3
[0075]In present Example, first a glass composition was obtained by mixing glass raw materials in such a way that the content of SiO2 was 58.2% by mass, the content of Al2O3 was 20.7% by mass, the content of MgO was 12.0% by mass, the content of CaO was 9.0% by mass and the content of Fe2O3 was 0.1% by mass, in relation to the total amount of the glass composition. In the glass composition, the sum content of SiO2, Al2O3, MgO and CaO is 99.9% by mass, and the ratio of the content of MgO to the content of CaO, MgO / CaO is 1.3. The composition of the glass composition obtained in present Example is shown in Table 1.
[0076]Next, the liquid phase temperature and the liquid phase viscosity were determined, the devitrification resistance was evaluated and the identification of the crystal species of the initial phase of devitrification was performed in exactly the same manner as in Example 1 except that the glass composition obtained in present Example was used. The results thus obtained ar...
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